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Find the limit or show that it does not exist.
$ \displaystyle \lim_{t \to \infty}\frac{\sqrt{t} + t^2}{2t - t^2} $
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02:19
Daniel Jaimes
Calculus 1 / AB
Chapter 2
Limits and Derivatives
Section 6
Limits at Infinity: Horizontal Asymptotes
Limits
Derivatives
Harvey Mudd College
University of Michigan - Ann Arbor
Idaho State University
Boston College
Lectures
04:40
In mathematics, the limit of a function is the value that the function gets very close to as the input approaches some value. Thus, it is referred to as the function value or output value.
In mathematics, a derivative is a measure of how a function changes as its input changes. Loosely speaking, a derivative can be thought of as how much one quantity is changing in response to changes in some other quantity; for example, the derivative of the position of a moving object with respect to time is the object's velocity. The concept of a derivative developed as a way to measure the steepness of a curve; the concept was ultimately generalized and now "derivative" is often used to refer to the relationship between two variables, independent and dependent, and to various related notions, such as the differential.
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All right. So we want to find this limit or show that does not exist. Um And as usual, some people like to do low petals rule here or talk about end behavior. Um I think the best way uh to do limits is to use algebra because limits have to exist before um before derivatives do so lumpy tiles rule doesn't make any sense. You may or may not know that already. So this is really big. The top is really big. The bottom is really big or maybe negative. Really big. I can't tell I'm just going to stop things from being big. So I'm going to divide top and bottom by T squared because that's the thing that's getting big the fastest. Okay, so what happens when I do that? Well, T T is like T to the one half. Right. So this is Um won over now. T to the 3/2. If you just use expanded rules. Um you can think of it as teeth. The negative three halves and then write it as 1/2 to the three halves. Okay, Plus T squared over T squared is one divided by um to T over T squared is two over tea and then minus T squared over two squared is one. I'm just going to write this one more time as something slightly different. This three halves is kind of strange. So one over T to the three halves plus one. And why do I want this? Usually don't want fractions infractions, but um, I only need one theorem for something getting big as T gets big one over T gets small, right one divided by a huge number is always going to be really, really small, as the number gets huger and huger, that goes towards zero, that's what that means. Okay, now, I just have that theorem everywhere in here, I have one divided by big number small, raised, the power of three halves is still small, so that limit, the limit of that part is zero, so then the top is zero plus one is one, divided by the bottom is two times this part goes to zero minus one, it's negative. So my answer is negative one, and I think that's the cleanest way to think about a limit like this.
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